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The Intelligibility of Filtered-Clipped Speech in Noise

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Earlier experiments have shown tht the use of highpass filtering prior to infinite clipping produces a speech signal which is highly immune to noise. Tests were performed to determine the cut-off frequency and asymptotic slope of the highpass filter which yield the highest intelligibility of filtered/clipped speech in noise. Filtered/clipped speech obtained using this optimum filter setting is shown to be considerably more immune to noise than other types of filtered/clipped speech and normal speech heard at the same average power level. Results are shown to confirm earlier views with respect to the significance of the various speech formants.

JAES Volume 18 Issue 3 pp. 299-303; June 1970
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